I'm not sure there were any graphical package managers in 2002 (when RH 7.3 was released). Why are you using such a dated distro? You may have better luck using something newer like Debian, CentOS (RH Enterprise Clone), or Fedora (RH community edition). Other than Debian, those distros may be a little bloated for embedded space. You can try Embedded Debian
(there's lots of documentation and howto stuff).
Maybe try one of these embedded
NOTE: I don't do embedded systems development, just sort of understand that the embedded space is a different animal than your typical desktop applications.
EDIT: Ah... FILE manager... Duh... Yeah, midnight commander may be your best bet.